摘要
为研究折流人工湿地的水力特性,构建了一系列不同长宽比和折流模式的人工湿地模拟装置(简称装置),通过示踪实验得到停留时间分布密度图(简称RTD曲线),并计算装置的水力特性参数。结果表明,长宽比2∶1的水平推流装置的回收率为远远小于长宽比4:1的水平推流装置,说明过小的长宽比会引起滞留现象。水平折流装置在无基质填充时,水力特性与水平推流装置基本相同,在填充基质后,回收率急剧下降到20%以下,水力特性反而变差。四廊道上下折流装置与其他装置相比显著减少了死区,同时保证较高的回收率(1.5 h内64.56%),具有较满意的水力特性。
In order to study the hydraulic characteristics of baffled flow constructed wetland,a series of simulation devices with different length to width ratios and baffling patterns was constructed,and a retention time distribution density map（RTD curve） as well as hydraulic characteristic parameters was obtained via tracing experiment. The results indicated that recycling rate of horizontal push device with a length to width ratio of 2∶1 is far less than that of the horizontal push device with length and width ratio of 4∶1,indicating that a retention phenomenon would be caused by a lower length and width ratio. Without matrix filling hydraulic characteristics of horizontal baffled flow devices and the horizontal push device were basically the same, whereas this value decreases sharply to less than 20% after filling of matrix, which revealed that hydraulic characteristics of this baffled type are poor. In the vertical baffled flow device with four galleries,dead zone was significantly reduced compared with other devices,and a high recycling rate（64.56% in 1.5 h） was guaranteed,which possess the most satisfactory hydraulic characteristic.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第11期5-9,14,共6页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2012ZX07105-002-03)
交通部科技项目(2009-353-333-340)
关键词
折流人工湿地
水力特性
RTD曲线
回收率
短路
死区
baffled flow constructed wetland
hydraulic characteristics
RTD curve
recycling rate
short cut
dead zone
